I have a duel ported sealed logic sub box for a 12 inch sub. I used it for about 6 months then got two subs so I dont need this one any more. And because it has the sub in it and then a 1/4 plastic front window sealing it in, it gives off crazy amounts of vibrations! The ports on top are 3 3/4 inches wide by 3 1/2 inches tall. its is basically brand new. And if you dont want it from me you can get it at best buy for like 100 bucks I think. The box is 16 1/2 x 16 1/2. this would be a great b-day gift. email me at discomonkey@yahoo.com or txt me at (360) 510-8646 thanks for your time have a great day. Location: lynden it's NOT ok to contact this poster with services or other commercial interests washington